Today I opened dotnet/roslyn@3ffd52c and received the following:

This warning is problematic for the following reasons:

1. The warning does not tell the user which version of the .NET SDK is needed
2. The warning does not tell the user where to get that version of the .NET SDK
3. Despite listing an explicit version of the .NET SDK in global.json, the IDE fails to automatically obtain and use this version

This bug makes "clone and go" configuration for a user-friendly open source repository impossible.